Raducanu is now 8/13 with Planet Sport Bet to win the US Open final after dismantling 17th seed Maria Sakkari in straight sets (6-1 6-4) .
She will now face fellow teen Leylah Fernandez (5/4) at 9pm UK time on Saturday evening, in a bid to become the first British female winner at Flushing Meadows since Virginia Wade in 1968.
Despite being a 400/1 longshot at the start of the tournament, incredibly Raducanu has not lost a set en route to the final and has dropped just 27 games in her six matches.
Going into the semi-finals she was still the 4/1 outsider to win the tournament.
The Kent teenager is the first qualifier - male or female - to make the final of any grand slam tournament following a sensational 6-1 6-4 victory.
Tearing up the record books, Raducanu is also now the first British woman to earn a place in a major final since Wade won Wimbledon in 1977.
Raducanu said on court: "Honestly the time here in New York has gone so fast. I've just been taking care of each day and three weeks later I'm in final. I can't actually believe it.
"Today I wasn't thinking about anyone else except for myself. While I have the moment I want to thank my team and the LTA and everyone at home for all their support.
"Since I've been here from the first round of the quallies I've had unbelievable support."
As for her chances in the final? "Is there any expectation? I'm a qualifier so technically there's no pressure on me," she added.
Such an amazing victory, so big it's even got 'well-known tennis buff' Liam Gallagher tweeting.
Full Planet Sport US Open women's final betting preview to follow.
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